java获取前端页面发送的cookie中的信息

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#java #Servlet #cookie #前端 #信息

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本文介绍了一个Java Web应用中读取HTTP Cookie的具体实现，包括如何解析Cookie并获取其属性如名称、值、过期时间等。

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package com.xalo.cookie;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet("/getcookie")
public class GetCookieServlet extends HttpServlet{
	
	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		req.setCharacterEncoding("utf-8");
		resp.setContentType("text/html;charset=utf-8");
		//获取cookie
		Cookie cookies[] = req.getCookies();
		
		PrintWriter out = resp.getWriter();
		if(cookies==null || cookies.length == 0){
			System.out.println("没有cookie");
		}else{
			for (Cookie cookie : cookies) {
				out.write("----------------------------------------"+"<br>");
				
				
				//获取cookie的解释内容
				String comment = cookie.getComment();
				out.write("comment:"+comment+"<br>");
				
				//获取cookie的键
				String key = cookie.getName();
				out.write("key:"+key+"<br>");
				
				//获取cookie的值
				String value = cookie.getValue();
				out.write("value:"+value+"<br>");
				
				//获取cookie的有效时间。
				int time = cookie.getMaxAge();
				out.write("time:"+time+"<br>");
				
				//获取服务器的IP对应的域名
				String domain = cookie.getDomain();
				out.write("domain:"+ domain+"<br>");
				
				//获取有效路径
				String path = cookie.getPath();
				out.write("path:"+ path+"<br>");
				
				//设置cookie是否加密，和https有关
//				cookie.setSecure(true);//默认为fale
//				cookie.getSecure();
				
			}
		}
		
	}
	
	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		doGet(req, resp);
	}
}